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Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | $ 165,358 | $ 186,681 | $ 334,908 | $ 382,590
Investment banking | [1] | 166,825 | 271,075 | 378,704 | 525,921
Revenue from contracts with customers | [1] | 653,827 | 790,553 | 1,352,052 | 1,585,119
Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 78,951 | 71,519 | 139,767 | 144,969
Advisory [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 87,874 | 199,556 | 238,937 | 380,952
Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 320,264 | 331,264 | 635,833 | 672,900
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 1,380 | 1,533 | 2,607 | 3,708
Global Wealth Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | 109,836 | 122,004 | 220,027 | 252,780
Investment banking | [1] | 4,065 | 5,056 | 8,223 | 10,203
Revenue from contracts with customers | [1] | 435,457 | 459,775 | 866,527 | 939,433
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 4,065 | 5,056 | 8,223 | 10,203
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 320,238 | 331,243 | 635,775 | 672,856
Global Wealth Management [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 1,318 | 1,472 | 2,502 | 3,594
Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | 55,522 | 64,677 | 114,881 | 129,810
Investment banking | [1] | 161,481 | 266,019 | 369,202 | 515,718
Revenue from contracts with customers | [1] | 217,029 | 330,717 | 484,141 | 645,572
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 74,886 | 66,463 | 131,544 | 134,766
Institutional Group [Member] | Advisory [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 86,595 | 199,556 | 237,658 | 380,952
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 26 | 21 | 58 | 44
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 1,279 |  | 1,279 |
Revenue from contracts with customers | [1] | 1,341 | 61 | 1,384 | 114
Other [Member] | Advisory [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 1,279 |  | 1,279 |
Other [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Other | [1] | 62 | 61 | 105 | 114
United States [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 577,902 | 737,311 | 1,219,892 | 1,479,608
United States [Member] | Global Wealth Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 435,457 | 459,775 | 866,527 | 939,433
United States [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 141,104 | 277,475 | 351,981 | 540,061
United States [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 1,341 | 61 | 1,384 | 114
United Kingdom [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 45,221 | 37,047 | 68,604 | 71,355
United Kingdom [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 45,221 | 37,047 | 68,604 | 71,355
Canada [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 7,614 | 7,782 | 30,137 | 17,123
Canada [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 7,614 | 7,782 | 30,137 | 17,123
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 23,090 | 8,413 | 33,419 | 17,033
Other [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | $ 23,090 | $ 8,413 | $ 33,419 | $ 17,033
[1] | Excludes revenues not derived from contracts with customers included in the Other segment.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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